Europhys. Lett.
Volume 47, Number 6, September 1999
Page(s) 722 - 728
Section Condensed matter: electronic structure, electrical, magnetic and optical properties
Published online 01 September 2002
DOI: 10.1209/epl/i1999-00450-8

Europhys. Lett, 47 (6), pp. 722-728 (1999)

Quantum coherence in $\rm Fe_8$ molecular nanomagnets

E. del Barco 1, N. Vernier 2, J. M. Hernandez 1, J. Tejada 1
E. M. Chudnovsky 3, E. Molins 4 and G. Bellessa 2

1 Departament de Física Fonamental, Universitat de Barcelona
Diagonal 647, 08028 Barcelona, Spain
2 Laboratoire de Physique des Solides, Bâtiment 510, Université Paris-Sud
91405 Orsay, France
3 Physics Department, CUNY Lehman College, Bronx, NY 10468-1589, USA
4 ICMAB (CSIC), Campus Universitat Autonoma de Barcelona
08193 Cerdanyola, Spain

(received 17 May 1999; accepted in final form 14 July 1999)

PACS. 75.45$\rm +j$ - Macroscopic quantum phenomena in magnetic systems.


We report observation of coherent quantum oscillations in spin-10 Fe8 molecular clusters. The powder of magnetically oriented Fe8 crystallites was placed inside a resonator, in a dc magnetic field perpendicular to the magnetization axis. The field dependence of the ac-susceptibility was measured up to 5 T, at 680 MHz, down to 25 mK. Two peaks in the imaginary part of the susceptibility have been detected, whose positions coincide, without any fitting parameters, with the predicted two peaks corresponding to the quantum splitting of the ground state in the magnetic field parallel and perpendicular to the hard magnetization axis.


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